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Jan. 10, 1928.

B. J. LINDGREN CONTROLLING MECHANISM FOR POWER PRESSES Filed Dec. 24. 1925 4 Sheets-Sheet 1 4 Sheets-Sheet 2 @m j \W O M;

B. J. LINDGREN CONTROLLING MECHANISM FOR POWER PRESSES Jan. 10, 1928.

Filed Dec. 24. 1925 B. J LINDGREN CONTROLLING MECHANISM FOR POWER PRESSES Jan. 10, 1928.

4 Sheets-Sheet 3 Filed Dec. 24. 1925 Jan. 10, 1928.

B. J. LINDGREN CONTROLLING MECHANISM FOR POWER PRESSES Filed Dec. 24, 1925 4 Sheets-Sheet 4 Illll 171116171 07" QWQOKAM M JTZ-I-orn eys Fatented Jeri lit), lift uurrso stars rTEuT oFFicsj E1393 3'. LINDGR-ETI, F BUFFALO, HEW YORK, ASSIGHGR TO NIAGARA MACHINE & TOOL VTGRKS, 0F BUFFALG, NEW YORK, A CORPORATION OF NEW YORK.

CONTROLLING 'MECHANISM FOR POWER PBESSES.

Application filed December 24, 1925.

been provided with tooth clutches which rendered it impossible to run the same at. comparativel high speed, because theteetli or cooperating shoulders of such clutches would become broken when engaged under high speed, and thus necessitate maintaiu ing a comparatively slow speed so that the engagement of the teeth or shoulders on the clutch members could be c'llected 'Wll'llOllll breaking them.

In order to permit of o eratin, i; the press at higher speed, the present invention cor.-

templates the use of a friction clutch, pref erably one which employs multiple friction discs which are intercalated and which, upon being pressed together, enable the movement from the driving member to the driven n'icmber of the same to be effect-ed gradually, inasmuch as a certain amount of slip g iage is permitted, between the multiple discs during the initial portion of the closing movement of'the clutch, but which slippage gradually reduced and finally eliminated altogether when the full pressure is applied to the clutch, whereby a positive closing movement of the clutch is permitted at high speed without liability of stripping any clutch teeth or shoulders.

l Vith thiscnd in view, the invention consists generally of a multiple disc clutch, and means for either causing the same to be opened or closed for each operation (it the press, as well as permitting the same to;v

operate continuously. the orui a'ting mechanism for this purpose being pre terribly constructeil as hereinafter shown and den in the accompanying drawings, F ire l is a side elevation of a stamping or punchii press embodying the preferred form of m invention. Figure 2 is a front elevation of the same. Figure 3 is a vertical longitudinal section, on an enlarged scale, taken on line (L-3, Figure 2. Figure i is a fragmentary vertical longitudinal section, on an enlarged scale. taken on line 4.4-, Figure and show ing the press controlling mechanism in a Serial No. 77,447.

running position but ready to be automatically stopped.

Figure 5 is a similar view showing the controlling mechanism in the position which it assumes Whenthe press is stopped. Figure 6 is a similar view showing the position of the parts of the'controlling mechanism when the same has been operated for starting the operation of the press. Figure 7 is a vertical cross section, on an enlarged scale, taken .on hne (-7, F1gu1e 1. Figure 8 is a fragmentary horizontalsection taken on line 8-8, Figure 6. Figure 9 is a fragmentary perspective view of the controlling mecha n sm. Figures 10 and 11 are perspective views of the brake arms or levers forming part of the brake mechanism, whereby the rotation of the main shaft is arrested for the purpose of promptly stopping the operation of tliepress when the driving clutch uncoupled. Figures 12 and 13 are similar views of the main or trip lever and the auxiliary or the cam lever which form. parts of they controlling mechanism.

In the following description, similar characters of reference indicate corresponding parts throughout the several views of the drawings.

This invention is applicableto stamping and punching presses which may be of various forms as to their detailed construction and the partieularpress which is shown in the drawings is, therefore, to be taken as typical of one capable of use in connection with this invention. 'As there shown, the press comprises a main frame 10 which is mounted upon a base frame 11 and provided with a lower bed 12, which is adapted to sup port the die or lower forming member, whereby the article is adapted to be shaped or punched, and an upper verti 'al guideway 13 in. which a slide 14 :moves vertically and adapted to carry a punch or upper forming member adapted to co-operate with the lower forining member or die in the production of articles to be stamped or punched. This upper slide it is recirnrocated vertically in its guideway by a. horizontal shaft 15, journaled transversely in a bearing 16 on the upper part of the main frame and provided with a crank or wrist 17, which is connected with the slide 1e by means of a pitmaii or connecting rod 18 so'that a vertical reciprocating motion is imparted to the punchor upper die member during the rotary moveill) ment of the crank shaft, in the usual and well known manner in this type of stamping or punching presses. In the present instance the blank or sheet to be cut or stamped is adjustably mounted by intermediate means on the bed or table 12 for the purpose of accurately fitting the die to the punch when setting up the press and also for taking up wear. The preferred form of these adjusting means is constructed as follows I- Movable vertically on the lower. bed 12 is a lower slide having an upper head adapted to carry the die and a lower shank 19 depending from the head and guided in vertical *ays arranged on opposite sides of an opening 22 in the bed plate 12. At its lower end, this shank .30 is engaged by a vertically swinging lifting lever 23 which is pivoted at its rear end on the main frame by means of a transverse horizontal pin 2st. The front end of the lifting lever is provided with a longitudinal notch or slot which receives the lower flat-sided portion 26 of a lifting rod 27, said tlat sided portion 26 engaging with the sides of: the notch so as to prevent this rod from turning in the lever 23, but still permitting an oscillating lIlOVOll'lOlll] of the rod andlcver relatively to each other in a vertical plane lengthwise of the machine. At its lower end, the lifting rod is provided with a head 28 which bears against the lower rounded side 2901f the litting lever and itsupper end passes through a vertical opening 30 formed in the front part of the bed 12. This upper end of the lifting red 27 is externally screw-threaded and receives an adjusting screw nut 31 which rests on top of the adjacent part of the bed12 and is provided on the lower part ot'its periphery with a worm rim or whee 32. Meshing with the front part of this worm wheel a worm 33 which. is secured to a horizontal transverse shaft 3 journaled in suitable bearings and 36, the bearings 2-35 being Formed on a bracket 37 which is detachably secured to the front side of" the bed 12 and the bearing 36 being dctachably secured to a hanger 3t sccured to the front side of the bed 12, adjacent to one corner thereot. The worm 3?) the bearings so as to be held against longitudinal movement. and rotation ot this worm is ell'ccted by means of a handle or wheel 39, secured to the outer end oi the shaft 3i, as shown in Figures 1 and 2.

Upon turning the worm 3 by means of handle 39, the worm wheel 32 and the screw nut 31 formed thereon are turned about the lifting rod 27, whereby the latter is raised or lowered, depending upon which way the shaft 3st is turned. Upon raising and lowering the rod 27, the die mounted on the lower slide 19. 20, is adjusted accordingl ithrough the medium of the lifting lever The is con ti ncd lilc'iaveenweight of these parts operates to keep the screw nut 31 and worm wheel 32 in engagement with the upper side of the front part of the bed 12, so that no separate means are required for l-zecping the parts in a normal position.

liy means of this mechanism. the lower slide may be raised or lowered for the purpose of accurately adjusting the lower forming member or die to the used level ot the feed when setting up the press, and also when it becomes necessary to compensate for wear, and after these parts are adjusted, they are reliably held in place without requiring any separate fastening for this purpose. More over this means of adj us-ging the lower cutting member or die permits oi ettectin-g this adjustment while the press is in operation, thereby facilitating setting up the press and reducing the cost of production accordingly.

The mechanism.forcontrolling the operation of the press in accordnace with my invention, is constructed as follows:

The numeral -1l-O represents a driving pulley or wheel which has its hub ll journaled on bushing d2 on. a part of the driving shalit This driving pulley is rotated contantly and motion may be transmitted to the same for this purpose by any suitable means. F or example, by means 01. a driving belt l3, passing with one turn around the driving pulley it) and with another turn around the pulley ll. of? an electric motor 415, vhilc its intermediate part passes around a tighten-er pulley 46. The base i"! of the motor is mounted on bracket l8, rising from the upper end of the mainframe or the press and the tightener pulley 116 is also mounted on the adjacent part of the motor base so that the prime mover of the press and the working partsot the some are practically mounted on the same frame so as to form one complcte unit therewith.

The driving pulley it) and the driving shaft 1o are adapted to be connected and disconnected by means of a friction clutch which permits ot the desired amount of slippage during the initial part of the closing movement of the clutch and thercluy prevent sudden closing of the clutch or the transmission of a shockt'rom the drivingto the driven members, which. otherwise. would be liable to either break or injure the same. The fricti n clutch which is preferably em ialoyed for this purpose, comprises a plurality of driving and driven triction discs D and 5t which are intcrcalated and which when pressed together cause the driving pulley 40 and driving shaft 15 to turn together, but when the same are fire and not subjected o lateral pressure. the same are uncoupled and permit the driving pulley to turn while the driving ft ron iins stationary. The driving ion discssfi are conn ill) la'i

ea er? with the driving pulley it) so as to turn therewith by means of one or more spline arms 51 interlocked with the periphery of the driving discs 44) and secured to the outer side oi the driving pulley a0, and the several driven friction discs, and splined at their inner edges to a hub 52 which is secured to the adjacent'part of the driving shaft 15. These two sets or groups of friction plates are arranged between the outer side of the web 53 of the driving pulley and a presser ring, disc or plate 54; so that upon moving the latter towardthe web of the driving pulley, the several friction plates will grip each other and cause the rotary motion of the driving pulley 40 to transmitted to the driving shaft while upon moving this presser disc 54 outwardly, thepressure of the several friction discs against each other will be released and the driving wheel will be uncoupled from the driving shaft 15. The inoven'ient ot the presser disc fi ltoward and from the driving wheel 40 for coupling and TmCOUPliDQ the driving wheel. and driving shaft niay'he eli'ected by varione means, those shown in the drawings heing constructed as follows:

Numeral IGPLCSGDiS an outwardly dished cap secured to the peripheral portion of the driving wheel 40 and provided cen trally with a bearing 56 in which the outer end of the driving shaft is journalcd. Gen trally on the inner side of the cap is mounted an adjusting ring 57 which is hacked by screws 58 on the cap" and on its inner side, this adjusting or thrust ring is connected with the presser plate by a plurality of toggles, each of which consists of a pair of outer and inner links 59, 60, which have their opposing ends pivotally connected with each other, while the out r end of the outer link is pivotally connected \viththc thrust ring- 57 andthe inner end of the inner link is pivotally connected with the prcsser plate or disc 54:. Upon pushing the opposing ends of the several pairs of link-s through and outwardlyso that they are straightened relatively to each other as shown by full lines in Figure 7, the pr i plat-c. will he 'lorccd inwardly and cause the two scls of friction discs to couplcthe driving wheel and shat't, but when the opposing ends of the several toggle links are drawn inwardly so that tl'iey stand at an angle relatively to each otheiu as shown by dotted lines in Figure 7. the prcsser plate 54 will be drawn out\\'2u' 'lly and release the lateral pressure against the friction discs so that the driving wheel and shaft will be uncoupled. The uniioldii'ig or scraping action on the to le links and the folding or nonu o 1 straightenmg actlon on the same is ellected by means of ashifting ring 61 connected on its periphery by means of a plurality of hnks62 with shitting ring 61 and capable frame 10.

' with an abutment,

of rotating freely in an annular groove formed on the periphery oi a shifting sleeve adjacent part of the driving shait't while their outer ends engage with openings in the shifting sleeve 63, as shown in Figure 7. Upon moving the rod (ll inwardly, the clutch will be coupled tor connecti the h'lving'pulley all) and the driving shaft while upon moving this rod (i loutwardly,- (his clutch will he uucouji led and the drivin wheel 4:0 will. rotate independently oi? the p driving shaft By turning the screws 59 haclzwardly or forwardly the position of the thrust ring or plate 57 may be adjusted to sew cure the desired pressure of the friction discs against each other.

Numerals 68 and 69 represent the upper and lower arms of an elbow lever which is pivotally mounted at its elhow by means of a pivot pin '70 on a bracket 71 projecting laterally from the adjacent part-o1 the main The upper arm 68 of this elbow lever is coupled with the outer end of the shifting rod 64 so as to be compelled to move therewith and still inside the driving shaft to turn independently of this lever. illlll'lOllgh this may be accomplished in various ways, the means for this purpose shown in the drawings consists of a coupling rod 7 having a crosspin 73 at its inner er. l. which engages with a longitudinal slot 76- in the outer end of the driving shaft a spherical coupling head 75 arranged atthe outer end ot-the coupling rod '72 and within a socket 76 on the outer end of the lever arm (58, a thrust ring 77 arranged at the inner end of the socket 76 and bearing against the rear side of the coupling head 75, and a thrust screw 78 engaging with the internally threaded outer part of the socket 7(5 and en gaging with the front side of the coupling head 75, as shown in Figure 7.

The nuniieral 79 represents an intermediate I or trip lever which is pivoted by means oi. a pinSO on the adjacent part of the main frame of the press and has its upper arm 81 connected by means of a shitti 11g rod with the lower arm 69 ot' the elbow lever. The rocking movement of this trip lever in the direction for lowering or swinging its upper arm 81 backwardly is limited by means of a stop screw 83 mounted on the arm of this lever and adapted to engage or stop surface 84 on the adjacent part'of the main frame, shown in Figures and 6. The numeral 85 represents av cam arm which is pivoted at its upper end on the same pin about which the trip lever turns and which projects downwardly from this pivot adjacent to the front side of the lower arm 86 of the trip lever. Between its upper and lower ends, the cam arm is provided with a bearing surface 87, preferably-in the form of a roller which is adapted to be engaged by a cam 88 arranged to turn with the driving shaft. In the preferred construction, this cam 88 is formed on a drum 89 which is splined to the driving shaft and overhangs the hub of the driving wheel 40 and has a cylindrical periphery which serves: as the gripping surface of a brake drum forming part of the brake mechanism for stopping the rotation of the drivingshaft. The periphery of this brake drum is adapted to be engaged by upper and lower brake shoes 90, 91, which are of segmental form and mounted on the inner sides of upper and lower bralr-e levers 92, 93 which are of curved form and pass over the upper and lower sides of the drum 89. The front ends of these two brake levers are connected by a coupling bolt 9. and their rear ends cross each other .in the form of a pair of shears, and the rear end of the upper brake arm engages with downwardly facing cam on the hub of the trip lever and the rear end of the lower brake arm or lever engages with an upwardly facing cam 96 on the hub of the trip lever. It follows from this construction that when the trip lever turned anti-clockwise in Figure 5, the cams 95 and 96 will cause the rear arm of the upper brake lever to be depressed and the rear end of the lower brake arm 93 to be raised, thereby engaging the brake shoes 90 and 91 with the brake drum 89 and stopping the rotation of the driving shaft 15 and the parts connected therewith, while upon moving the trip lever 79 clockwise, as in Figure (3, the trip cams and 96 will be retracted from the rear free ends of the brake levers 92 and 98 and thereby permit the bralre shoes to release their grip onthe brake drum and enable the driving shaft to he turned by power dcrivcd fromthe i'notor 45 or elsewhere. By adjust-- ii'ig the bolt 91-, the position of the brake shoes 90 and 91 relative to the brake drum may be varied to suit requirements. When the brake levers 92 and 93 are released, the lower arm drops by gravity from the under side of the brake drum, while the upper brake arm or lever is lifted therefron': by means of a spring 97 hearing at one end against an alznitment 98 on the main frame, while its opposite end bears against a shoulder 99 formed on a rod 100, which latter passes through the bracket 98 and is connected at its lower end with the upper brake arm 92, as shown in Figure The lower ends of the cam arm 85 andv the lower arm 86 of the trip lever are connected by a toggle mechanism whereby, at times, these arms maybe moved to .vard and from each other. In its preferred construetion, this toggle mechanism comprises a front toggle link 101 pivoted at its lower end on the cam arm 85, and a toggle lever pivoted by a pin 102 on the lower end of the arm 86 and having its front arm 1023 connected by means of a pin 104: with the rear end of the front toggle link. Intermediate of its upper and lower ends, the upper arm 105 of the trip lever 79 has pivoted thereto the rear end of a shifting lever 106 by means of a pin 10?. This shifting lever 106 yieldingly held in its elevated posi tion by a tension device which. in the present case, consists of sl'iifting rod. 108 pivotally connected at its upper end by means of a pin 109 with the rear end of t e shifting lever 1.00, while its lower end passes through a guide lug 110 on the main frame and a spring 111 surrounding the tension rod 108 and bairing at its upper end against a shoulder on the rod 108, while its lower end bears againstthe guide lug 110 which forms an ab-utn'ient therefor. Between its front and rear ends, the shifting ring is connected by means of a pin 121 with the upper end or a toggle bar 112 which latter is pivotz-illy connected at its lower end by means of a pin 11? with the rear arm ll.-'-l of the toggle lever. On its rear part, the lower arm 86 of the trip lever is provided with a stop 115 which is adapted to he engaged by the rear arm 11d of the toggle lever for arresting the movement of the lat ter when the toggle is in its' straightened or unfolded position, shown in Figures 4: and 5.

Down ard movement of the shifting lever 106 for starting the press is effected by motion derived from a vertically movable treadle 116 which is pivoted at its rear end by means of a pin 11'? on the base of the machine. Movement from this treadle transmitted to the shifting lever 106 by means of an intermediate rock arm 11S pivoted on the main frame to swing vertically, a lower shifting rod 119 connecting the front part of the treadle 116 with the lower part of the intermediate rock lever 118, and an upper shifting rod 120 connecting the uppart of the intermediate roe arm 118, 15th the upper part of the shifting lever 106, as best shown in i igure 1.

The operation of this controlling mecha nism is as follows: I

When the press at rest, the parts are in the position indicated in Figure 5, at which time the cam 88 is in enga ement with the roller 87 and holds the cam arm 85 in its downwardly and rearwardly moved position, the spring 111 holds the shifting arm or lever 106 in its elevated position so that the toggle link 101 and the toggle 95 and 96 to turn-the brake lev Ill) 105 produces an upward pull on the shift ing rod 82,-andthereby causes the clutch rod 0 1 to be drawn outwardly so as to dis engage the driving and driven friction discs of the clutch from each other and thereby uncouple the constantly rotating driving pulley from the driving sh n15. At the same time, the rotation ot the trip lever 79 in this direction causes the brake cams infthe direction for causing the brake shoes to engage with opposite sides of the brake drum and hold the driving shaft against rotation.

For the purpose of starting the press, the attendant depresses the treadle' 116, whereby the shitting arm 106 is loweredas indicated in Figure 6. This lowering of the arm 100 causestherear arm 11 1- of the toggle lever to be depressed and the front arm' 103 of the, same to be raised, together with the toggle link 101, thereby rolding or brealring the toggle connection between the cam arm 85 and the lower arm of the trip lever, which releases both the trip lever and the cam lever and permits the trip lever to move clockwise and the cam lever to move anti-clockwise about the axis provided by thepivot pin 80. This movement of these levers is produced by the continued down lever 09 and 09 to be turned anti-clockwiseas shown in Figure 7, and thereby producing an inward motion oi? the shitting rod (34: which operates to mess theclutch disrs together and couple the driving wheel e0 with llie driving shaft At the same time that the trip arm 79 moves clockwise to couple the clutch, the cam arm moves down\vardly and rcarwardly under its own wcightl'ar enough to cause the cam roller 87 to clear the cam 88 as shown in'llig. 0, and thereby release the driving shaft from any resistance and permit the same to start its turning movement promptly and imn'iediately upon closing the clutch. 'llhe anti-clockwise movement of the trip lever 79 also causes the brake operating cams 95 and 90 to release their pressure onthe brake arms 92 and 9.3 and thereby release the brake slioesi rom the bral zedrun'i the instant that the clutch is coupled, and thereby permit the driving shaft to begin its rotary nioven'ient the instant lilioSlllllG is coupled with the prime mover.

If the 'operatonwishesthe press to go through only one cycle of operations which is accomplished during one rotation of the driving shaft, the operator takes his foot off the tire l e 110 innnediately after starting the pres hereby the treadle, together withshi'tting over 106, is raised due to the resilience of the spring 111, thereby causing the toggle bar 112 to raise the rear arm 114: of the toggle lever and depress the front arm 103 thereof, together with the toggle link 101 so that the pivotal connections between these severa-lparts are in line, as shown in Figure 1, whereby the cam arm 85 is moved tor iardly and upwardlyso that its roller 8'? is in the path of the cam 88, as shown in the same figure. As the driving shaft 15 approaches the end of one complete rotation, the throw-out cam 88 mounted thereon engages with the roller 87 and moves the cam lever 85 downwardlyand forwardly which movement, due to the straightened position of the toggle lint: 101 and front toggle arm 108, is transmitted through these toggle members to the trip lever 79 so that the latter is turned anti-clockwise, as shown in Figure 5, and causes an upward pull onthe rod 82 whereby the elbow lever 68, 09 is shifted in the direction for uncoupling the clutch and disconnecting the driving shaft 15 from the constantly rotating driving pulley 10. At the same-time, this moven'ient of the trip lever causes the brake cams and 96 to drawthc brake shoes 90 and 91 against the opposite sides of the brake drum 89 so that the rotation ot the driving shaftand the movement of the, parts associated therewith is arrested immediately when the power is thrown oil from the press.

If, however, it is desired to run the press continuously instead of starting and stopping thc'same, this can be accomplished by the operator keeping his foot on the treadle and maiutaii'iing the latter in its depressed position, '\vhcrel:)y the shifting arm 100 will be maintainedconstantly in its (lepressed position and the toggle link and lever will. remain in the unfolded position, as shown in, l igure 0, whereby the cam roller 87 will be maintained out 01 the path of (he throw-oil" 321,111 88, the brake cams 95, 96- will release their pressure on the bralrcarms andv permit the driving shaft to rotate freely, and the trip lever 7 9 will remain turned into its extreme position in an anti-clockwise direction with its stop 83 resting against the shoulder 84 so that the elbow lever 08 and 09 will hold the clutch in its coupled position tor continuously transmitting power from the prime mover to the driving shaft of the pressand the latter is caused to perform succe, ul cycles of its operations without interruption between succeeding cycles.

1t wi l be apparent from the foregoing description of this invention that owing to the acter that the clutch operates independently to couple and uncouple the driving wheel and driving shaft, that the brake mechanism operates rapidly to release the driving shaft the instant that the clutch is coupled and to arrest the rotation of the driving shaft when the clutch is uncoupled, and that these operations are accomplished by means which are easily operated and reliably hold the parts either in their operative or inoperative position so that the press is positively locked against operation wh n it is not required, thereby avoiding all liability of the operator becoming injured accidentally.

I claim as my invention 1. A controlling mechanism for a power press having a driving shaft and a driving pulley, a friction clutch interposed between said driving shaft and driving pulley, a trip lever connected with said clutch, means for moving said trip lever marmally in the direction for closing said clutch, means for moving said trip lever by power in the opposite direction for opening said clutch, comprising a cam lever, a toggle connecting said cam lever and trip lever, a cam on the driving shaft adapted to engage said cam lever, and means for folding and unfolding said toggle comprising a shifting lever mounted on the trip lever, a bar pivotally connected with said shifting lever and said toggle, a spring for raising said shifting lever, and a manually operated rod connected with said shifting lever for depressing the same.

2. A controlling mechanism for a power press having a driving shaft and a driving pulley, comprising a friction clutch interposed betweensaid shaft and pulley, an elbow lever having one arm connected with said clutch, a trip lever having one of its arms connected with the other arm of said elbow lever, a toggle lever pivoted on the other arm-of said trip lever, a cam arm. a toggle link pivoted on said cam arm and pivotally connected with one arm of said toggle lever, a shifting lever pivoted on that arm of said trip lever which is connected with the elbow lever, a bar pivotally connecting the other arm of said toggle lever with said shifting lever, a spring for yieldingly hold- :ing said shifting lever in its upper position, a treadle connected with said shifting lever, and a cam on said driving shaft adapted to engagesaid cam arm and deflect the same and the trip lever through the medium of said toggle link and said toggle lever.

3. Acontrolling mechanism for a power press having a driving shaft and a driving pulley, comprising a friction clutch interposed between said shaftand pulley, an elbow lever having one arm connected with said clutch, a trip lever having one of its arms connected with the other arm of said elbow lever, a toggle lever pivoted on the other arm of said trip lever, a cam arm, a

toggle link pivoted on said cam arm and.

pivotally connected with one arm of said toggle lever, a shifting lever pivoted on that arm of said trip lever which is connected with the elbow lever, a bar pivotally connecting the otl er arm of said toggle lever with said shifting lever, a spring for yieldingly holding said shifting lever in its upper position, a treadle connected with said shifting lever, a cam on said driving shaft adapted to engage said cam arm and deflect the same and the trip lever through the medium of said toggle link and said toggle lever, a brake drum rotatable with said driving shaft, and a shoe adapted to be engaged with said drum by motion derived from said trip lever.

l. A controlling mechanism for apower press having a driving shaft and a driving pulley, comprising a friction clutch interposed between said shaft and pulley, an elbow lever having one arm connected with said clutch, a trip lever having one of its arms connected with the other arm of said elbow lever, a toggle lever pivoted on the other arm of said trip lever, a cam arm, a toggle link pivoted on said cam arm and pivotally connected with one arm of said toggle lever, a shifting lever pivoted on that arm of said trip lever which is connected. with the elbow lever, a bar pivotally connecting the other arm of said toggle lever with said shifting lever, aspring for yieldingly holding said shifting lever in its upperposition, a treadle connected with said shifting lever, a cam on said driving shaft adapted to engage said cam arm and deflect the same and the trip lev r through the medium of said toggle link and said toggle lever, a brake drum rotatable with said driving shaft, a. brake lever having a shoe adapteal to engage said brake drum, and a, cam turning with said trip lever and adapted to move said brake lever for engaging said brake shoe with said brake drum.

5. A controlling mechanism for a power press having a driving shaft and a driving pulley, comprising a friction clutch interposed between said shaft and pulley, an elbow lever having one arm connected with said clutch, a trip lever having one of its arms connected with the other arm of said elbow lever, a toggle lever pivoted on the other arm of said trip lever, a cam arm, a

toggle link pivoted on said cam arm and pivotally connected with one arm of said lllii toggle lever, a shifting lever pivoted on that arm of said trip lever which is connected with the elbow lever, a bar pivotally connecting the other arm of said toggle lever with said shifting lever, a spring for yieldingly holding said shitting lever in its upper position, a treadle connected with said shifting lever, a cam on said driving shaft adapted to engage said cam arm and deflect the same and the trio lever through the medium of said toggle lint: and said toggle lever, a brake drum rotatable with said driving shaft, two brake levers having shoes engaging with opposite sides of said drum and having two of their corresponding ends connectcd and their opposite ends crossed, and two brake cams arranged on said tri lever on opposite sides oi the axis thereof and engaging respectively with the crossed ends of said brake levers.

G. A controlling mechanism'for a power press having a. driving shaft and a driving pulley, comprising a friction clutch inter posed between said shaft and pulley, an;

elbow lever having one arm connected with said clutch, a trip lever having one of its arms connected with the other arm of said pivoted on the other arm of said trip lever, a cam arm, a toggle link pivoted on said cam arm and pivotally connected with one arm of: said toggle lever, a shifting lever pivoted on that arni of said trip lever which is connected I *ith the elbow lever, a bar pivotally connecting the other arm of said toggle lever with said shifting lever, a spring for yieldingly holding said shitting lever in its upper positioo, a treadle connected with said shifting lever, a cam on said drivingshaft adapted to engage said jcain arm and deflectthe same and the t-riplever through the medium of said toggle link and said toggle lover, a dru a rotatable with said driving I having shoes engag with opposite sides of said drum and ng two of their corresponding ends connected and their opposite ends crossed, two hralre cams arranged on said trip lever on opposite sides of the axis thereof and engagine respectively with the crossed ends of d brake levers, and a yielding support for holding one of said brake levers in an elevated position.

In testimony whereof I allix my signature.

BROR J. LINl'KlREN. 

